aikido/807PSE and local feedback

Jaap · 27th April 2009, 07:50 PM

I want to make a poweramp with 6sl7 +6N6p aikido at the front, followed by two parallel 807 tubes in pentode se configuration.
I suspect some feedback would be handy and I like the local variant of it. Could I copy the solution of the T-rex 300B amp ? Here a 47K resistor and a 2 uF cap are in series between the plate and the grid of the 300B. I suppose that the designers know what they are doing. I don't, so my question is can i use the same solution and the same values of components for the parallel 807's ?

aardvarkash10 · 27th April 2009, 08:16 PM

plenty recently about this subject - check out Alex's website for the 807 version including the schematic. http://www.tubeaudio.8m.com/807/807.html

Jaap · 28th April 2009, 07:54 AM

Quote:

Originally posted by aardvarkash10
plenty recently about this subject - check out Alex's website for the 807 version including the schematic. http://www.tubeaudio.8m.com/807/807.html

Problem is that i want to build with an aikido frontstage. That is a different concept than the RH idea (which i already tried with el84)

27th April 2009, 07:50 PM	#1
Jaap diyAudio Member Join Date: Dec 2002 Location: Netherlands	aikido/807PSE and local feedback I want to make a poweramp with 6sl7 +6N6p aikido at the front, followed by two parallel 807 tubes in pentode se configuration. I suspect some feedback would be handy and I like the local variant of it. Could I copy the solution of the T-rex 300B amp ? Here a 47K resistor and a 2 uF cap are in series between the plate and the grid of the 300B. I suppose that the designers know what they are doing. I don't, so my question is can i use the same solution and the same values of components for the parallel 807's ?

27th April 2009, 08:16 PM	#2
aardvarkash10 diyAudio Member Join Date: Mar 2007 Location: Auckland, NZ	you just described a parallel RH807 plenty recently about this subject - check out Alex's website for the 807 version including the schematic. http://www.tubeaudio.8m.com/807/807.html __________________ Yes, conservatism thrives on low intelligence and poor information. But the liberals in politics... continue to back off, yielding to the supremacy of the stupid. It's turkeys all the way down. - George Monbiot, guardian.co.uk, 6 Feb 2012

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